T Monocerotis
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Monoceros |
| Right ascension | 06h 25m 13.00s |
| Declination | +07° 05′ 08.6″ |
| Apparent magnitude (V) | 5.58–6.58 |
| Characteristics | |
| Evolutionary stage | Supergiant + Main-sequence |
| Spectral type | G3Iabv + A0p |
| Variable type | δ Cep |
| Astrometry | |
| Radial velocity (Rv) | +48.8±9.1 km/s |
| Proper motion (μ) | RA: +0.846 mas/yr Dec.: −3.025 mas/yr |
| Parallax (π) | 0.533±0.066 mas |
| Distance | approx. 6,100 ly (approx. 1,900 pc) |
| Other designations | |
| T Mon, BD+07 1273, HD 44990, HIP 30541, HR 2310, SAO 113845, TIC 206703838, TYC 145-875-1, IRAS 06225+0706, 2MASS J06251300+0705084 | |
| Database references | |
| SIMBAD | data |
T Monocerotis (T Mon) is a classical Cepheid variable star in the constellation of Monoceros, visually located 2° northwest of Epsilon Monocerotis. Along with Eta Aquilae and X Sagittarii, it is one of the Cepheid variables considered easy to find in the night sky. It is located 1350 parsecs or 4400 light-years from the solar system. The brightness of T Monocerotis varies between apparent magnitude +5.58 and +6.62 over a period of 27.0247 days. This period has been increasing over time, being 27.0092 days before the year 1900.